Where did u unplug the vent hose from, the tank or the fitting on the gunnell? 
 
Should not be any gas in the vent hose, it is higher than the tank. I know some gets in when filling tank,  sometimes there is a loop put in to trap water or fuel, but should be able to blow through it with no back pressure 
 
Disconnect both ends and make sure it***8217;s not restricted in any way 
 
On this tank, the vent and fill are on the forward end of the tank, not the stern end ,right?
		 
		
		
		
		
		
		
		
		
	
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